Rengar possible changes and ideas

Hello i have some interisting ideas about rengar and his kit so he can be more controlable more fun and straight forword 4 both teams i ve seen the new nerfs on his empored w which was his way of escape and now its been removed ... my idea revorves around his w and his R rengar before the nerfs could jump in kill or not ang get out ,after the nerf he does the same thing but avoids only one cc. Also he never used his w (normal) as a heal during an asassination but only 4 damage. So my idea about his R keep it as it is but remove the crit , also add a new effect { if rengar kills the target that he leaped to within 2 seconds he becomes invisible(not comouflazed) for 1- 1.5 - 2 seconds and he cannot attack or use any ability during his invisibility }
By doing that we removed a big damage part of his kit but we made his ultimate a utility spell , a way to get in and get out if he succed or die if he is not As i said we removed his R crit so we have to give him some damage back so my ideas about this is to change his w Rengar new W { rengar deals AoE PHYSICAL damage around him ( not magic as it is and it has an ad scalling not ap as it is right now ) if he was damaged by a jungle monster within the last 2 seconds he heals himself for the damage he took } Rengar Empored W {it does the same as the first in addition he heals him self for the total damage his next ability will deal ) by doing this rengar can no longer build tank and his w scalles better in the game because its a physical damage spell and has an ad scalling I also did the math and i found that if rengar has 400 ad and builds full leathality ( 3 items runes masteries )
if we give 0,75 ad ratio on his w he does the same damage as in the live servers but AoE and we dont want that because he a single target focus champ so we can lower his ad ratio from 0.75 to 0.5 or 0.4 and give the rest to Q or E ( in my opinion on E ) So after all this we game him a utility ultimate which provides a way in and out if he is succesfull in his HUNT and allso i give u an other way to change his numbers by changeing ad ratios in the new W I hope u like my idea and i get an answer with your opinion
thank u for reading have a nice day